lib/libc/rpc/pmap_getport.c

   1 /*      $OpenBSD: pmap_getport.c,v 1.11 2010/09/01 14:43:34 millert Exp $ */
   2
   3 /*
   4  * Copyright (c) 2010, Oracle America, Inc.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are
   8  * met:
   9  *
  10  *     * Redistributions of source code must retain the above copyright
  11  *       notice, this list of conditions and the following disclaimer.
  12  *     * Redistributions in binary form must reproduce the above
  13  *       copyright notice, this list of conditions and the following
  14  *       disclaimer in the documentation and/or other materials
  15  *       provided with the distribution.
  16  *     * Neither the name of the "Oracle America, Inc." nor the names of its
  17  *       contributors may be used to endorse or promote products derived
  18  *       from this software without specific prior written permission.
  19  *
  20  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  25  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  27  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  29  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * pmap_getport.c
  36  * Client interface to pmap rpc service.
  37  */
  38
  39 #include <unistd.h>
  40 #include <rpc/rpc.h>
  41 #include <rpc/pmap_prot.h>
  42 #include <rpc/pmap_clnt.h>
  43 #include <sys/socket.h>
  44 #include <net/if.h>
  45
  46 static struct timeval timeout = { 5, 0 };
  47 static struct timeval tottimeout = { 60, 0 };
  48
  49 /*
  50  * Find the mapped port for program,version.
  51  * Calls the pmap service remotely to do the lookup.
  52  * Returns 0 if no map exists.
  53  */
  54 u_short
  55 pmap_getport(struct sockaddr_in *address, u_long program, u_long version,
  56     u_int protocol)
  57 {
  58         u_short port = 0;
  59         int sock = -1;
  60         CLIENT *client;
  61         struct pmap parms;
  62
  63         address->sin_port = htons(PMAPPORT);
  64         client = clntudp_bufcreate(address, PMAPPROG,
  65             PMAPVERS, timeout, &sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
  66         if (client != NULL) {
  67                 parms.pm_prog = program;
  68                 parms.pm_vers = version;
  69                 parms.pm_prot = protocol;
  70                 parms.pm_port = 0;  /* not needed or used */
  71                 if (CLNT_CALL(client, PMAPPROC_GETPORT, xdr_pmap, &parms,
  72                     xdr_u_short, &port, tottimeout) != RPC_SUCCESS){
  73                         rpc_createerr.cf_stat = RPC_PMAPFAILURE;
  74                         clnt_geterr(client, &rpc_createerr.cf_error);
  75                 } else if (port == 0) {
  76                         rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
  77                 }
  78                 CLNT_DESTROY(client);
  79         }
  80         if (sock != -1)
  81                 (void)close(sock);
  82         address->sin_port = 0;
  83         return (port);
  84 }